CN113020262B - A kind of metal clad plate rolling method with prefabricated cross corrugated interface - Google Patents

Abstract

The invention relates to the technical field of metal composite plate preparation, in particular to a rolling method of a metal composite plate with a prefabricated cross corrugated interface, and aims to solve the technical problems of low interface bonding strength, severe warping and edge cracking and the like of the metal composite plate manufactured by the existing rolling method. The following technical scheme is adopted: the method comprises the steps of prefabricating corrugations on the surface to be compounded of a substrate by using crossed corrugated rollers with triangular waveforms, wherein the ratio of the amplitude of the corrugations to the thickness of the substrate is between 1/20 and 1/10, the reduction rate is between 5% and 10%, prefabricating corrugations on the surface to be compounded of a compound plate by using crossed corrugated rollers with sinusoidal waveforms, the ratio of the amplitude of the corrugations to the thickness of the compound plate is between 1/10 and 1/2, the reduction rate of the process is between 10% and 50%, then stacking the substrate plate blank and the compound plate blank, and flat rolling under the condition that the reduction rate is lower than 50%. Compared with the traditional rolling method, the method has the advantages that the bonding strength can be improved, the residual stress is reduced, the panel warping is controlled, and the high-quality metal composite plate can be prepared.

Description

A metal clad plate rolling method with prefabricated cross corrugated interface

technical field

The invention relates to the technical field of metal composite plate preparation, in particular to a metal composite plate rolling method for prefabricating cross corrugated interfaces.

Background technique

The metal composite panel is a composite material that is made of two or more layers of heterogeneous metals processed by a special process to achieve interfacial metallurgical bonding. On the premise of maintaining the characteristics of the clad metal, the comprehensive mechanical, physical and chemical properties of the clad plate are significantly enhanced to form a complementary effect of advantages, thereby saving rare and precious resources. Metal composite panels are widely used in aerospace, oil and gas pipelines, construction, automobiles, chemicals, electrical equipment, electronic instruments and other fields. Due to the advantages of simple process, low cost and high efficiency, rolling cladding is widely used in the preparation of metal composite plates of ferrous metal/ferrous metal, non-ferrous metal/ferrous metal, non-ferrous metal/non-ferrous metal and other systems. Common methods include cold rolling, hot rolling Rolling, explosion-rolling, asynchronous rolling, etc. However, due to the difference in the properties of the two metals, it is difficult to achieve a firm composite, and there is inevitably a problem of different elongation, and then there will be a large residual stress inside the rolled clad plate, resulting in a composite plate after rolling. The board will produce serious warping and edge cracking, which restricts the large-scale preparation of high-quality composite boards.

Contents of the invention

The invention aims to solve the technical problems of low bonding strength, serious warping and edge cracking of the metal composite plate made by the existing rolling method. For this reason, a metal clad plate rolling method with prefabricated cross corrugated interface is proposed.

The technical solution adopted by the present invention to solve its technical problems is:

A metal composite plate rolling method for prefabricating a cross corrugated interface, comprising the following steps:

S1. Substrate and double board preparation: select a metal plate with relatively small deformation resistance as the base plate, and select a metal plate with relatively large deformation resistance as the double board (the relatively small and relatively large here refer to the deformation of the base plate and the double board. The conclusions drawn from the comparison of the resistance);

S2. Blank making: Put the base plate into a corrugated rolling mill for rolling. The upper roll of the corrugated rolling mill is a cross corrugated roll a, and the lower roll is a flat roll. After rolling, the upper surface of the substrate is a cross corrugated surface, and the lower surface is a plane to form a substrate Slab: Put the doubler plate into the corrugated rolling mill for rolling. The upper roll of the wave leveling mill is a cross corrugated roll b, and the lower roll is a flat roll. After rolling, the upper surface of the doubler plate is cross corrugated, and the lower surface is flat to form a doubler plate Slabs; use a wire brush to polish the corrugated surfaces of the base plate slab and double plate slab to be combined to remove surface oxide layers and pollutants, stack the corrugated surfaces of the base plate slab and double plate slab relative to each other, and fix the edges (to ensure that the base plate slab and the double plate slab will not be misaligned and deviated when they are subjected to non-uniform tangential force during the rolling process) to obtain the metal composite plate slab;

S3, composite plate rolling: when adopting the cold rolling method, the metal composite plate slab obtained in step S2 is directly sent to a flat roll mill for rolling, and when the hot rolling/warm rolling method is adopted, the metal composite plate slab obtained in step S2 is rolled After being sent to the heating furnace to be heated to the specified temperature, it is sent to the flat roll mill for rolling. The upper and lower rolls of the flat roll mill are all flat rolls. The bonding interface obtained in this process is a complex cross corrugated surface and the upper and lower surfaces are Flat metal composite panels;

S4, annealing (i.e. adopt common annealing means in this field: cooling after first heating);

S5. Finishing: Trimming after straightening to make a finished product.

Further, in step S2, when the substrate slab is prefabricated, the corrugation curve of the cross corrugated roller a is triangular, the ratio of its wave amplitude to the thickness of the substrate is between 1/20 and 1/10, and the reduction rate of this process is 5% Between 10% and 10%, it is finally guaranteed to form a microstructure of intersecting triangular corrugations on the upper surface of the substrate; when prefabricating the double plate slab, the corrugation curve of the cross corrugated roller b is a sinusoidal curve or a parabola, and the ratio of its amplitude to the thickness of the double plate Between 1/10 and 1/2, the reduction rate is between 10% and 50%, finally ensuring the formation of a cross corrugated structure on the upper surface of the doubler plate.

Further, in step S2, the wavelength ratio between the cross corrugated roller a and the cross corrugated roller b is between 1/10 and 1/5.

The beneficial effects of the present invention are:

1) By prefabricating the cross corrugated shape on the surface of the double board to be bonded, the difference in elongation between the hard-to-deform metal and the easy-to-deform metal can be compensated, and the cross corrugated roller can form an independent concave-convex area on the double board surface, and the material Gridding, which destroys the concentrated orientation of residual stress after rolling, is beneficial to solve the problem of plate warpage; in addition, after rolling with cross corrugated rolls, the surface area of the double plate will increase, and the fresh and activated metal atoms will be exposed to a wider range. Promote the diffusion of metal atoms of the two materials, and the bonding strength is further improved;

2) Prefabricate a shallower cross corrugation shape on the surface of the substrate to be bonded, such a small cross corrugation will not affect the mechanical properties of the substrate and the change of the plate shape, and the corrugation is triangular, and this corrugation is easy. Stress concentration phenomenon is formed at the place. When subjected to the action of the second-pass rolling force, the surface of the substrate is more likely to break, and the two plates will have a strong mechanical meshing effect in the contact area of a smaller scale, and the bonding effect is better;

3) Cross corrugations with different parameter scales are prefabricated on the base plate and doubler plate respectively, the reduction amount per pass is small, the billet making process is simple, the requirements for equipment and process parameters are low, and the warping and edge cracking control ability of the plate is strong .

Description of drawings

Figure 1 is a schematic diagram of a prefabricated substrate slab;

Fig. 2 is the schematic diagram of prefabricated double board slab;

Fig. 3 is the schematic diagram of preparing metal composite plate slab;

Fig. 4 is a schematic diagram of a rolling cross-corrugated interface metal composite plate;

Fig. 5 is a structural schematic diagram of cross corrugated roller a;

Fig. 6 is a structural schematic diagram of cross corrugated roller b;

In the figure, 1┄ base plate; 2┄ doubler board; 3┄ cross corrugated roll a; 4┄ flat roll; 5┄ base plate slab; 6┄ cross corrugated roll b; billet; 9┄ heating furnace; 10┄ metal composite plate.

Detailed ways

Embodiment one:

Referring to Figures 1-6, a method for rolling a metal clad plate with a prefabricated cross corrugated interface includes the following steps:

S1. Substrate and compound board preparation: Select the 5052 brand aluminum alloy plate with relatively small deformation resistance as the substrate 1, the length, width and height are 100, 100, and 3 mm respectively, and select the AZ31 brand magnesium alloy plate with relatively large deformation resistance as the compound board 2. The length, width and height are 100, 100, and 1mm respectively;

其中R为交叉波纹辊b6的半径，0≤t≤1；轴向截线方程为

其中0≤t≤1,压下率为20％，上下轧辊线速度均为7.5m/min，轧制后复板2的上表面为交叉波纹面，下表面为平面，形成复板板坯7；使用钢丝刷对基板板坯5和复板板坯7待结合的波纹表面进行打磨，去除表面氧化层和污染物，将基板板坯5和复板板坯7波纹表面相对堆叠放置，并将边缘固连，得到金属复合板板坯8；S2. Blank making: Put the base plate 1 into a corrugated roll mill for rolling. The upper roll of the corrugated flat rolling mill is a cross corrugated roll a3. 2mm, the lower roll is a flat roll 4, the average radius of the upper and lower rolls is 75mm, and the reduction rate is 10%. After rolling, the upper surface of the substrate 1 is a cross corrugated surface, and the lower surface is a plane to form a substrate slab 5; The compound plate 2 is put into the corrugated rolling mill for rolling, and the upper roll of the corrugated rolling mill is a cross corrugated roll b6, and the radial section line equation of the cross corrugated roll b6 is

Where R is the radius of the cross corrugated roller b6, 0≤t≤1; the equation of the axial section line is

Among them, 0≤t≤1, the reduction rate is 20%, and the line speed of the upper and lower rolls is 7.5m/min. After rolling, the upper surface of the doubler plate 2 is a cross corrugated surface, and the lower surface is flat, forming a doubler plate slab 7 Use a wire brush to polish the corrugated surfaces of the base plate slab 5 and the double plate slab 7 to be combined, remove the surface oxide layer and pollutants, stack the corrugated surfaces of the base plate slab 5 and the double plate slab 7 oppositely, and place The edges are fixedly connected to obtain the metal composite plate slab 8;

S3. Composite plate rolling: adopt hot rolling, send the metal clad plate slab 8 obtained in step S2 into the heating furnace 9, heat it to 400° C. for 5 minutes, and then send it into the flat roll mill for rolling. , the lower rolls all adopt flat rolls 4, the upper flat rolls and the lower flat rolls of the flat roll mill in this step have the same size, and the reduction rate is selected as 40%. The upper and lower surfaces obtained by this process are plane and the bonding interface is a complex cross corrugation Surface metal composite panel 10. This process obtains a metal composite plate 10 whose bonding interface is a complex cross corrugated surface and whose upper and lower surfaces are planes;

S4. Put the flat-rolled metal composite plate 10 into the heating furnace 9 for annealing treatment, the annealing temperature is 300° C., and the time is 30 minutes;

S5. Finishing: Trimming after straightening to make a finished product.

Embodiment two:

Referring to Figures 1-6, a method for rolling a metal clad plate with a prefabricated cross corrugated interface includes the following steps:

S1. Substrate and compound board preparation: Select the 5052 brand aluminum alloy plate with relatively small deformation resistance as the substrate 1, the length, width and height are 100, 100, and 3 mm respectively, and select the AZ31 brand magnesium alloy plate with relatively large deformation resistance as the compound board 2. The length, width and height are 100, 100, and 1 mm respectively.

其中R为交叉波纹辊b6的半径，0≤t≤1；轴向截线方程为

其中0≤t≤1,压下率为10％，上下轧辊线速度均为7.5m/min，轧制后基板1的上表面为交叉波纹面，下表面为平面，形成基板板坯5；再将复板2放入上述波纹辊轧机轧制，压下率为20％，其他参数不变，轧制后形成复板板坯7；使用钢丝刷对基板板坯5和复板板坯7待结合的波纹表面进行打磨，去除表面氧化层和污染物，将基板板坯5和复板板坯7波纹表面相对堆叠放置，并将边缘固连，得到金属复合板板坯8；S2. Billet making: put the base plate 1 into a corrugated roll rolling mill for rolling, the upper roll of the corrugated flat rolling mill is a cross corrugated roll b6, and the radial section equation of the cross corrugated roll b6 is

Where R is the radius of the cross corrugated roller b6, 0≤t≤1; the equation of the axial section line is

Wherein 0≤t≤1, the reduction rate is 10%, the linear speed of the upper and lower rolls is 7.5m/min, the upper surface of the substrate 1 after rolling is a cross corrugated surface, and the lower surface is a plane, forming a substrate slab 5; Put the doubler plate 2 into the above-mentioned corrugated roll mill for rolling, the reduction rate is 20%, other parameters remain unchanged, and form the doubler slab 7 after rolling; The combined corrugated surface is polished to remove the surface oxide layer and pollutants, and the corrugated surfaces of the substrate slab 5 and the cladding slab 7 are stacked relative to each other, and the edges are fixed to obtain the metal composite slab 8;

S3. Composite plate rolling: adopt hot rolling, send the metal clad plate slab 8 obtained in step S2 into the heating furnace 9, heat it to 400° C. for 5 minutes, and then send it into the flat roll mill for rolling. , the lower rolls all adopt flat rolls 4, the upper flat rolls of the flat roll mill in this step are the same size as the lower flat rolls, and the reduction rate is selected to be 40%. The metal composite panel 10;

S4. Put the flat-rolled metal composite plate 10 into the heating furnace 9 for annealing treatment, the annealing temperature is 300° C., and the time is 30 minutes;

S5. Finishing: Trimming after straightening to make a finished product.

Comparative example one:

Referring to Figures 1-6, a method for rolling a metal clad plate with a prefabricated cross corrugated interface includes the following steps:

S1. Substrate and compound board preparation: Select the 5052 brand aluminum alloy plate with relatively small deformation resistance as the substrate 1, the length, width and height are 100, 100, and 3 mm respectively, and select the AZ31 brand magnesium alloy plate with relatively large deformation resistance as the compound board 2. The length, width and height are 100, 100, and 1 mm respectively.

其中R为交叉波纹辊b6的半径，0≤t≤1；轴向截线方程为

其中0≤t≤1,压下率为20％，上下轧辊线速度均为7.5m/min，轧制后复板2的上表面为交叉波纹面，下表面为平面，形成复板板坯7；使用钢丝刷对基板板坯5和复板板坯7待结合的波纹表面进行打磨，去除表面氧化层和污染物，将基板板坯5和复板板坯7波纹表面相对堆叠放置，并将边缘固连，得到金属复合板板坯8。S2. Billet making: Put the substrate 1 into a flat roll mill for rolling. The upper and lower rolls of the rolling mill are flat rolls 4, the reduction rate is 10%, and the linear speed of the upper and lower rolls is 7.5m/min. After rolling, the substrate 1 The upper surface is flat to form the substrate slab 5; the doubler plate 2 is put into a corrugated rolling mill for rolling, and the upper roll of the corrugated rolling mill is a cross corrugated roll b6, and the radial section equation of the cross corrugated roll b6 is

Where R is the radius of the cross corrugated roller b6, 0≤t≤1; the equation of the axial section line is

Among them, 0≤t≤1, the reduction rate is 20%, and the line speed of the upper and lower rolls is 7.5m/min. After rolling, the upper surface of the doubler plate 2 is a cross corrugated surface, and the lower surface is flat, forming a doubler plate slab 7 Use a wire brush to polish the corrugated surfaces of the base plate slab 5 and the double plate slab 7 to be combined, remove the surface oxide layer and pollutants, stack the corrugated surfaces of the base plate slab 5 and the double plate slab 7 oppositely, and place The edges are fixed to obtain the metal composite plate slab 8 .

S3. Composite plate rolling: adopt hot rolling, send the metal clad plate slab 8 obtained in step S2 into the heating furnace 9, heat it to 400° C. for 5 minutes, and then send it into the flat roll mill for rolling. , the lower rolls all adopt flat rolls 4, the upper flat rolls of the flat roll mill in this step are the same size as the lower flat rolls, and the reduction rate is selected to be 40%. metal composite panels 10.

S4. Put the flat-rolled metal composite plate 10 into the heating furnace 9 for annealing treatment, the annealing temperature is 300° C., and the annealing time is 30 minutes.

S5. Finishing: Trimming after straightening to make a finished product.

The characteristics and the performance of the clad plate rolled by embodiment and comparative example are observed and measured, relevant items and parameters are shown in the following table:

evaluation item Embodiment one Embodiment two Comparative example one Sheet warping not obvious not obvious slight edge cracking phenomenon not obvious not obvious slight Tensile shear strength (rolling direction) 44.17MPa 37.25MPa 31.27MPa Tensile shear strength (transverse direction) 40.42MPa 33.43MPa 28.12 MPa Tensile strength (rolling direction) 256.65MPa 224.46 MPa 202.53MPa Tensile strength (transverse direction) 273.44MPa 235.41 MPa 217.94MPa

The experimental data in the above table is measured on the DNS200 electronic universal testing machine, except that the rolling method adopted during processing is different, other selected parameters are all the same, the results are as follows: as shown in the above table, compared with the first embodiment and the implementation Example 2 can obtain a higher quality rolled Mg/Al composite plate, and Example 1 is the best, because when the substrate slab is prefabricated, cross corrugated rolls with larger amplitudes are used, so that the two plates can be combined during the composite process. Produce greater plastic deformation. In the second embodiment, two kinds of cross corrugated rolls with the same corrugation parameters can also be used to obtain high-quality composite plates, but the performance parameters of rolled Mg/Al composite plates can be further improved by optimizing and matching the thickness and parameters of the corrugated rolls . In Comparative Example 1, slight warping and edge cracking occurred in the rolled Mg/Al clad plate, because the substrate was prefabricated through one pass of thinning, and the corrugation was not prefabricated on one side of the substrate, so when rolling, the joint interface The resulting plastic deformation is small. Using the method involved in the present invention to roll the Mg/Al composite plate, the tensile and shear strength has been significantly improved, indicating that the bonding strength of the bonding interface can be effectively increased by prefabricating a large-amplitude surface and a rough surface on one side of the component plate. It can also achieve the purpose of improving the residual stress distribution state and reducing the warpage of the plate.

Preferably, in step S2, when the substrate slab 5 is prefabricated, the corrugation curve of the cross corrugated roller a is triangular, the ratio of its wave amplitude to the thickness of the substrate 1 is between 1/20 and 1/10, and the reduction rate of this process is between 1/20 and 1/10. Between 5% and 10%, it is finally guaranteed to form a microstructure of intersecting triangular corrugations on the upper surface of the substrate 1; when prefabricating the double plate slab 7, the corrugation curve of the cross corrugated roller b is a sinusoidal curve or a parabola, and its amplitude is the same as that of the double plate The thickness ratio of 2 is between 1/10 to 1/2, and the reduction rate is between 10% and 50%, so as to finally ensure the formation of a cross corrugated structure on the upper surface of the doubler plate 2. In the first embodiment, the reduction rate of the prefabricated substrate slab 5 is selected as 10%. In other embodiments, 5% or 7% can also be used, depending on the specific sheet material; The ratio of 1 thickness is 1/10, and in other embodiments, it can also be 1/15 or 1/20; the reduction rate when prefabricating the substrate slab 7 is selected as 20%, and 10%, 30% can also be used in other embodiments. % or 50%, etc., depending on the specific sheet conditions; the ratio of the amplitude of the cross corrugated roller b to the thickness of the doubler board 2 is 1/2, and in other embodiments, it can also be 1/10 or 1/5.

Further, in step S2, the wavelength ratio between the cross corrugated roller a3 and the cross corrugated roller b6 is between 1/10 and 1/5. This is more conducive to the formation of small corrugations on the substrate and large corrugations on the doubler plate, thereby further improving the bonding strength.

Further, in step S3, when the metal clad plate slab 8 is sent to the flat roll rolling mill for rolling, the reduction ratio of a single pass is selected from 20% to 50%, and the clad plate is rolled to the required level through multiple passes. thickness.

The present invention is not only applicable to the compounding of double-layer metal plates, but also the compounding of three-layer metal plates. The upper and lower surfaces of the substrate are prefabricated with the same cross corrugated surface to form the substrate slab 5, and two doubler slabs 7 are stacked and placed directly above and directly below the substrate slab 5, so that the corrugated surfaces of the substrate slab 5 and the doubler slab 7 On the other hand, the edges are then fixedly connected to obtain a metal composite panel slab 8 .

The present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent deformations or replacements without violating the spirit of the present invention. These equivalent deformations or replacements are all included in the claims of this application. within the limited range.

Claims (3)

1. A rolling method of a metal composite plate with a prefabricated cross corrugated interface comprises the following steps:

s1, preparing a substrate and a compound plate: selecting a 5052-grade aluminum alloy plate with relatively small deformation resistance as a base plate (1), and selecting an AZ 31-grade magnesium alloy plate with relatively large deformation resistance as a composite plate (2);

s2, blank making: putting the substrate (1) into a wave flat rolling mill for rolling, wherein the upper roller of the wave flat rolling mill is a cross corrugated roller a (3), the lower roller of the wave flat rolling mill is a flat roller (4), and the upper surface and the lower surface of the substrate (1) are cross corrugated surfaces and flat surfaces after rolling to form a substrate plate blank (5); placing the compound plate (2) into a wave flat rolling mill for rolling, wherein an upper roller of the wave flat rolling mill is a crossed corrugated roller b (6), a lower roller of the wave flat rolling mill is a flat roller (4), the upper surface of the compound plate (2) after rolling is crossed corrugated, and the lower surface of the compound plate is a plane, so that a compound plate blank (7) is formed; polishing the to-be-combined corrugated surfaces of the substrate plate blank (5) and the composite plate blank (7) by using a steel brush, removing a surface oxide layer and pollutants, oppositely stacking the corrugated surfaces of the substrate plate blank (5) and the composite plate blank (7), and fixedly connecting the edges to obtain a metal composite plate blank (8);

when a substrate slab (5) is prefabricated, the corrugation curve of the crossed corrugation roller a is triangular, the ratio of the amplitude of the corrugation to the thickness of the substrate (1) is between 1/20 and 1/10, the reduction rate of the process is between 5% and 10%, and finally the crossed triangular corrugation of a micro structure is formed on the upper surface of the substrate (1); when the composite plate blank (7) is prefabricated, the corrugation curve of the crossed corrugated roller b is a sine curve, the ratio of the amplitude of the sine curve to the thickness of the composite plate (2) is 1/10 to 1/2, the reduction rate is 10 to 50 percent, and finally the crossed corrugated structure is formed on the upper surface of the composite plate (2);

the wavelength ratio of the cross corrugated roll a (3) to the cross corrugated roll b (6) is between 1/10 to 1/5;

s3, rolling of the composite plate: sending the metal composite plate blank (8) obtained in the step S2 into a heating furnace (9) by adopting a hot rolling/warm rolling method, heating to a specified temperature, and then sending into a flat rolling mill for rolling, wherein the upper and lower rollers of the flat rolling mill adopt flat rollers (4), and the metal composite plate (10) with a complex cross corrugated surface as a bonding interface and a plane upper and lower surfaces is obtained by processing in the process;

s4, annealing;

s5, finishing: and (5) straightening, cutting edges and preparing a finished product.

2. The method of rolling a metal composite plate with a preformed cross-corrugated interface as claimed in claim 1, wherein: in step S3, when the metal composite plate blank (8) is sent to a flat rolling mill for rolling, the selection range of single-pass reduction rate is 20% -50%, and the composite plate is rolled to the required thickness through multiple passes.

3. A method of rolling a metal composite plate with a preformed cross-corrugated interface as claimed in claim 2, wherein: preparing a substrate slab (5) and two compound slab (7) in step S1, prefabricating the same crossed corrugated surfaces on the upper surface and the lower surface of the substrate (1) to form the substrate slab (5) in step S2, respectively stacking and placing the two compound slab (7) right above and below the substrate slab (5) to enable the corrugated surfaces of the substrate slab (5) and the compound slab (7) to be opposite, and then fixedly connecting the edges to obtain the metal composite slab (8).

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